bath tap cold water is only dribbling out , basin taps and toilet are fine, purchased a new tap ,no change. there appears to be no pressure with the cold water in this tap, any solutions.

Did you run the cold water before putting in the new valve?

May have dirt in line and need it blown out. Use something to make a trough so water does not go behind wall when turned on.

Does this clear problem? Let us know .

Chuck